CVE-2016-5384 - Double Free

Severity

46%

Complexity

39%

Confidentiality

106%

fontconfig before 2.12.1 does not validate offsets, which allows local users to trigger arbitrary free calls and consequently conduct double free attacks and execute arbitrary code via a crafted cache file.

fontconfig before 2.12.1 does not validate offsets, which allows local users to trigger arbitrary free calls and consequently conduct double free attacks and execute arbitrary code via a crafted cache file.

CVSS 3.0 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 4.6. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P).

Demo Examples

Double Free

CWE-415

Double Free

CWE-415

While contrived, this code should be exploitable on Linux distributions which do not ship with heap-chunk check summing turned on.


               
}
free(buf1R2);

Overview

First reported 8 years ago

2016-08-13 01:59:00

Last updated 8 years ago

2017-01-18 02:59:00

Affected Software

Fedora 24

24

Debian Linux 8.0 (Jessie)

8.0

References

RHSA-2016:2601

DSA-3644

Third Party Advisory

92339

USN-3063-1

https://cgit.freedesktop.org/fontconfig/commit/?id=7a4a5bd7897d216f0794ca9dbce0a4a5c9d14940

Patch

FEDORA-2016-6802f2e52a

FEDORA-2016-e23ab56ce3

Third Party Advisory

[Fontconfig] 20160805 fontconfig: Branch 'master' - 3 commits

Release Notes

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